Tested | Whittley SL25 with 400HP V-10 Mercury 4-Stroke

We've tested several versions of Whittley's SL25 over the years - this one comes with the brand new Mercury 400HO 5.7L V-10 4-stroke outboard.
Comes with comparative performance stats with twin 150s, single 300 V08 and single 400 V-10.

[@davidrauschenbach6871]

Looked surprisingly smooth and quiet! Thanks for the look!

[@Froggy543]

OCD, why didn't you test the V10 at 3500rpm like the others?

[@Cammo-vp1gl]

I was thinking the same, they must pick a speed or rpm and give figures for each, not just show the best result for the new product. And 27kmh is a very low speed, might as well put a 150 on the boat 🤣. I have a SL26 with 300 hp 6.2 litre v8 stern drive with bravo 2 leg and between 30-50 kmh I’m getting 1.3 to 1.4 km per litre. That equates to 3000 to 3500 rpm. Over 3500 rpm fuel burn increases slightly but it’s still good for such a heavy boat. Around 60 kmh I get 1 km per litre wot is 75 kmh for .7 litre.

[@scottwillis5494]

@@Cammo-vp1gl yep old mate that does these tests always seems to dind a creative way to make the motor hes paid to test sound better than previous ones hey. Even if it involves traveling at snail pace to get the right figueres

[@Steve-jq4st]

Never warmed to Whittleys. Neither a cruiser or a fishing boat in my view.

[@stevesizman8606]

Probably 300k plus as tested.

[@scottchristensen8458]

One Day...☀️💫🌏🎣🐠🐟🐬🐳

[@wotwe]

So your saying you get 51% further in the same time using the Yamaha, and still use only use $4.00 more fuel. Wow those yams are great!

[@FishingMonthly]

You can spin those figures as much as you like either way depending on your preferences.

[@scottwillis5494]

How about some figuers at a normal cruise speed. Their best economy id pointless. Noone is doing most of their miles at 27kph

[@shaunlennon5693]

So what’s the economy at 25kn. 14kn is barely on the plane. It’s a bit useless giving us that figure.